第1个回答 2022-11-01
包含以下三种用法:
1.主将从现,即主句为一般将来时,从句为一般现在时。
例句:I will stay at home if it rains.
2.主句含有情态动词,即must、may、can等从句为一般现在时。
例句:You may have an accident if you drive too fast.
3.主句为祈使句,从句要用一般现在时态。
例句:Don't play puter games if you don't finish your homework.